<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>天气案例</title>
  <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
<div id="root">
  <h2>今天天气很{{weather}}</h2>
  <!--@xxx="yyy"  yyy可以写一些简单的语句-->
  <button @click="changeWeather">切换天气</button>
</div>
</body>
<script type="text/javascript">
  Vue.config.productionTip = false//阻止vue在启动时产生生产提示
  new Vue({
    el: "#root",
    data: {
      isHot: true
    },
    computed: {
      weather() {
        return this.isHot ? '炎热' : '凉爽'
      }
    },
    methods: {
      changeWeather() {
        this.isHot = !this.isHot
      }
    }
  })

</script>
</html>